diff --git a/www/whiteboard/export.js b/www/whiteboard/export.js
index 1a96cf799..300085c92 100644
--- a/www/whiteboard/export.js
+++ b/www/whiteboard/export.js
@@ -30,6 +30,7 @@ define([
             canvas.setWidth(w);
             canvas.setHeight(h);
             canvas.calcOffset();
+            canvas.renderAll();
 
             module.ext = '.png';
             canvas_node.toBlob(cb);